Rainbow-electronics T89C5115 Manual do Utilizador descarregar pdf (Página 22)

T89C5115

4128A–8051–04/02

Figure 8. Lower 128 bytes Internal RAM Organization

Upper 128 Bytes RAM The upper 128 bytes of RAM are accessible from address 80h to FFh using only indirect

addressing mode.

Expanded RAM The on-chip 256 bytes of expanded RAM (ERAM) are accessible from address 0000h to

00FFh using indirect addressing mode through MOVX instructions. In this address

range.

Note: Lower 128 bytes RAM, Upper 128 bytes RAM, and expanded RAM are made of volatile

memory cells. This means that the RAM content is indeterminate after power-up and

must then be initialized properly.

Bit-Addressable Space

4Banksof

8Registers

R0-R7

30h

7Fh

(Bit Addresses 0-7Fh)

20h

2Fh

18h

1Fh

10h

17h

08h

0Fh

00h

07h

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 104 105

Sem comentários

Rainbow-electronics T89C5115 Manual do Utilizador Página 22